Bring Component into Vue if necessary

Question

Bring Component into Vue if necessary

I have multiple menu types and would like to determine which type of menu to use by configuring it in .env.local. For example: VUE_APP_MENU_TYPE=2

Here is the code snippet from my javascript file:

let menu = false;
if (process.env.VUE_APP_MENU_TYPE === "2") {
  menu = require("./type2/Type2.vue");
}
if (menu === false) {//default menu if env is missing
  menu = require("./default/Default.vue");
}
export default menu;

However, this may result in an error message saying

Failed to mount component: template or render function not defined.

An alternative approach would be:

import Default from "./default/Default.vue";
import Type2 from "./type2/Type2.vue";
let menu = Default;
if (process.env.VUE_APP_MENU_TYPE === "2") {
  menu = Type2;
}
export default menu;

Although this solution works, all menu components are compiled into the code, even those that will never be used because VUE_APP_MENU_TYPE is known at compile time and does not change until recompilation.

Is there a way to dynamically import a component at compile time?

javascript vue.js vuejs2 vue-component

Answer 1

Answer №1

Give this a shot:

menu = require("./type2/Type2.vue").default;

You can find more details in this helpful response

When working with ES6 imports (export default MyComponent), the exported module follows the format
{"default" : MyComponent}
. The import statement takes care of this assignment for you, but when using
require("./mycomponent").default
, you need to handle the conversion yourself. If you want to avoid this, consider using module.exports instead of export default

Regarding the second part of the question...

Is it feasible to dynamically import a component at compile time?

I haven't personally attempted it, and I'm skeptical. Webpack doesn't execute the code during build; it simply scans for certain patterns:

It looks for require() to determine which modules should be bundled
The DefinePlugin replaces strings like process.env.VUE_APP_MENU_TYPE with values from environment files, transforming code such as
```
if ("3" === "2") {
```
Other plugins detect that
```
if ("3" === "2") {
```
will never be true and eliminate "dead code"

The real question is whether require scanning occurs prior to dead code elimination. If so, all possible menu components will end up in the bundle. Unfortunately, I don't have the answer - you'll need to experiment

On the flip side, utilizing dynamic async components (as mentioned in other responses) is a safer option. Although Webpack builds all potential menu components, each has its own JavaScript chunk (file in the dist directory). If the app only loads one of them, it should work fine (keep in mind that loading will be asynchronous - at runtime - leading to an additional server request)

Answer 2

Give this a shot:

menu = require("./type2/Type2.vue").default;

You can find more details in this helpful response

When working with ES6 imports (export default MyComponent), the exported module follows the format
{"default" : MyComponent}
. The import statement takes care of this assignment for you, but when using
require("./mycomponent").default
, you need to handle the conversion yourself. If you want to avoid this, consider using module.exports instead of export default

Regarding the second part of the question...

Is it feasible to dynamically import a component at compile time?

I haven't personally attempted it, and I'm skeptical. Webpack doesn't execute the code during build; it simply scans for certain patterns:

It looks for require() to determine which modules should be bundled
The DefinePlugin replaces strings like process.env.VUE_APP_MENU_TYPE with values from environment files, transforming code such as
```
if ("3" === "2") {
```
Other plugins detect that
```
if ("3" === "2") {
```
will never be true and eliminate "dead code"

The real question is whether require scanning occurs prior to dead code elimination. If so, all possible menu components will end up in the bundle. Unfortunately, I don't have the answer - you'll need to experiment

On the flip side, utilizing dynamic async components (as mentioned in other responses) is a safer option. Although Webpack builds all potential menu components, each has its own JavaScript chunk (file in the dist directory). If the app only loads one of them, it should work fine (keep in mind that loading will be asynchronous - at runtime - leading to an additional server request)

Answer 3

Answer №2

In my opinion, dynamically loading the component is the optimal choice available to you. Check out this link for more information.

Answer 4

In my opinion, dynamically loading the component is the optimal choice available to you. Check out this link for more information.

Answer 5

Answer №3

If only I had known about a webpack configuration that could have solved this problem.

Within the vue.config.js file

const path = require("path");

module.exports = {
  configureWebpack: {
    resolve: {
      alias: {
        MENU: path.resolve(
          __dirname,
          (() => {
            if (process.env.VUE_APP_MENU_TYPE === "2") {
              return "src/components/header/CategoriesMenu/Type2/Type2.vue";
            }
            return "src/components/header/CategoriesMenu/Default/Default.vue";
          })()
        ),
      },
    },
  },
};

Inside src/components/header/CategoriesMenu/index.js

import menu from "MENU";
export default menu;

Although, truth be told, I prefer using require.

Answer 6

If only I had known about a webpack configuration that could have solved this problem.

Within the vue.config.js file

const path = require("path");

module.exports = {
  configureWebpack: {
    resolve: {
      alias: {
        MENU: path.resolve(
          __dirname,
          (() => {
            if (process.env.VUE_APP_MENU_TYPE === "2") {
              return "src/components/header/CategoriesMenu/Type2/Type2.vue";
            }
            return "src/components/header/CategoriesMenu/Default/Default.vue";
          })()
        ),
      },
    },
  },
};

Inside src/components/header/CategoriesMenu/index.js

import menu from "MENU";
export default menu;

Although, truth be told, I prefer using require.

Bring Component into Vue if necessary

Answer №1

Answer №2

Answer №3

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